SMB issues..

Im having some annoying issues with connecting to my windows 2003 server.. I have films, music and TV shows on the server which itunes looks to so i can watch my ATV.. but in order to do this i need to mount the folders to my desktop..YAWN!!(is there another way??)
In the last few days ive been having some intermittent network issues.. Sometimes i can connect to the server and the drives mount and other times i just cant connect and it says the server isnt there, even though its in the finder under shared, which says network connection failed when clicking on it..
Ive tried rebooting both imac(mid 2011 21 inch) and server and nothing it appears it wants to work when it wants..
Any ideas..

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